Gemstone



FIG. 1 is a perspective view of a gemstone;

FIG. 2 is an elevation view of the gemstone of FIG. 1, which is identical for the front, rear, left side, and right side of the gemstone;

FIG. 3 is a top plan view of the gemstone of FIG. 1; and,

FIG. 4 is a bottom plan view of the gemstone of FIG. 1. 

CLAIM The ornamental design for a gemstone, as shown and described. 